Storage battery.



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Eqw. SMITH.

STORAGE BATTERY. APPLICATIQN FILEJ)l D E: 31.1913.

lmemedsep't. 19m.

STORAGE BATTERY.

Lieder?.

' Application led December 31, 1913.

To all whom it may concern:

Be it known that I, EDWARD VANTON SMITH, a citizenof the United States,residing at Philadelphia, in the county of Philadelphia and State ofPennsylvania, have invented certain new and useful mprovements inStorage Batteries, of which the following is a specification.

Trouble has been experienced in thev use of positive pole plates havingrubber retainers .arranged against the peroxid active material.. I havediscovered that this trouble is due to some chemical action that takesplace, in use, between the peroxid andthe hard rubber material orcomposition of the retainer and that chemically inert material, as lampblack, prevents or minimizes this action, but if incorporated into thehard rubber material it weakens the retainers and renders them brittleand unfit for use. I obviate these defects and disadvantages by means ofa composite retainer, one part of which consists of the usual or regularhard rubber material, and the retaining wall of which consists of amixture of that hard rubber material and chemically inert material, asfinely divided lamp black. The parts of the retainer in combinationprovide notlonly the necessary resistance to chemical action forpreventing or minimizing the destructive or corrosive action between theretainer and the peroxid to which reference has been made, but also thenecessary mechanical strength for withstanding 'the usage to 1which theplate is necessarily sub-` jected.

The invention will be claimed at the end hereof but will be firstdescribed in connection with the embodiments of it chosen forillustration in the accompanying drawings in which Figure l, is a sideview of a tube embodying features of the invention. Fig. 2, is aVertical" central section of the same. Figs. 3 and t, are horizontalsections taken respectively through a ring between slits and through oneof the slits, and Fig. 5, is a sectional View illustrating amodification.

The outside part 1, of the composite tube consists of hard rubbercomposition or relatively pure high grade vulcanite. This is possessedof the requisite mechanical strength and by reason of its location onthe Specification of Letters Patent. Patented Sept. 5, 1916.

Serial No. 809,632.

come active, there is little or no tendency to chemical or destructiveaction. The inner part 2, is chemically inert although somewhat brittleand lacking-in `mechanical strength. It consists of a hard rubbercomposition containing a large admixture of chemically inert material,as lamp* black. For example, as much as one-half of it may be finelydivided lamp black, but the proportions may be Widely varied. The innerand the outer parts or walls of the tube may well be integral. By thecombination of the mechanically strong outer part and the chemicallyinert though brittle inner part, the tubes satisfactorily fulfil therequirements in the batteries of the kind specified and make thosebatteries more enduring than heretofore although such batteries `are incomparison with many others Very enduring even without the presentinvention but by the latter their life is greatly prolonged.

The invention is of course notA limited to tubular plates with tubularretainers but is applicable to fiat plateswith flat retainers. In Fig.5, 2, are layers like the layers 2, above described, and they are shownas applied on each side of a layerl, like the layer 1, above described.j The idea of using two inert layers 2a, is to Vinsure that one of themshall come against the peroxid. course only one suchplayer is necessary.The advantages above described apply of course to the modification shown.in F ig. 5.

lVhat I-claim is: l

1. A composite tube for storage battery plates having its inner part ofrubber material containing finely divided lamp black and its outer partof relatively pure hard rubber.

2. A composite tube for storage battery plates comprising an integralinner layer of rubber and chemically resistant material and its outerlayer of strong tough rubber material.

3. A composite retainer for storage battery plates consisting ofintegral exposed layers of which one is of chemically reslstant materialand the other of strong and tough material.

4. A composite retainer for storage bat Ofv tery plates comprisingintegral layers one an admixture of finely divided inert mateof rubberand finely divided inerl material rial. and the other of hard rubber. 1EDWARD VANTON SMITH. 5. A composite retainer for Storage bat- Vitnesses:

5 tery plates comprising a layer of hard rub- LOUIS H. FLANDERS, ber anda layer of hard rubber containing EDGAR L. LONGAKER.

